- Study guides, Class notes & Summaries

 Speed of a body is defined as the distance travelled by the body in unit time. The SI unit of speed is metre/second (m/s). Distance travelled Speed Time taken  If ‘s’ is the distance travelled by a body in time ‘t’, then its speed ‘v’ is given as s v t  Speed of a body is a scalar quantity. It can be zero or positive but can never be negative.  If a body covers equal distances in equal time intervals, howsoever small the intervals may be, then it is said to hav...